NAU7801KGI - 24-Bit Bridge Sensor ADC, I2C | Nuvoton
Référence : NAU7801KGI ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1 000 | $0 | $0,00 |
NAU7801KGI Présentation
A bridge-sensor ADC is a precision data converter that amplifies, filters, and digitizes the tiny differential output of a Wheatstone bridge. In the signal-chain hierarchy, it sits between the analog sensor and the digital controller: sensor -> programmable gain amplifier (PGA) -> delta-sigma modulator -> digital filter -> I2C bus -> microcontroller. Integrating the entire front end in one IC eliminates discrete amplifier and filter design errors.
Key features include 24-bit resolution with up to 23-bit ENOB, an integrated low-noise PGA for small differential inputs, on-chip digital filtering that suppresses line noise, dual-channel multiplexed inputs in the NAU780 family architecture, and a standard I2C interface for easy microcontroller integration. Low power consumption makes the part suitable for battery-operated weighing and sensing products.
Architecturally, the delta-sigma modulator oversamples the amplified bridge signal, and the on-chip digital sinc filter decimates the stream to a high-resolution word, achieving the noise floor needed for weigh-scale and strain-gauge accuracy. The NAU7802 sibling in the same family is documented by Nuvoton as a complete front-end solution for bridge/sensor measurement with up to 23-bit ENOB.
Typical applications include electronic weigh scales, strain-gauge measurement, pressure-sensor interfaces, and battery-powered precision sensing nodes where microvolt-level sensitivity is required. The DIP package simplifies prototyping and through-hole assembly.
Design consideration: keep the analog front-end layout clean - use a stable low-noise reference, Kelvin-connect the bridge excitation and sense lines, and allow the digital filter to settle after gain or channel changes before reading data.
This page synthesizes distributor data, family cross-references, and application guidance beyond the raw datasheet listing.
Alternatives de remplacement direct pour NAU7801KGI — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesNAU7801KGI Valeurs maximales et caractéristiques électriques
| Résolution | 24 bit |
| ENOB (Effective Number of Bits) | Up to 23 bit (NAU780 family) |
| Converter Type | Delta-Sigma ADC |
| Application | Bridge sensor / weighing front end |
| Input Type | Differential (bridge) |
| Canaux | 2 (NAU780 family dual-channel) |
| Interface | I2C |
| PGA | Integrated programmable gain amplifier |
| Digital Filter | On-chip sinc digital filter |
| Boîtier | DIP |
| Type de montage | Through-Hole |
| Power Consumption | Low power (battery-suitable) |
Guide de configuration des broches du NAU7801KGI dip
Configuration des broches du NAU7801KGI (boîtier dip). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour NAU7801KGI.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
NAU7801KGI convient pour 6 applications: Electronic Weigh Scales, Strain Gauge Measurement, Pressure Sensor Interfaces, Battery-Powered Precision Sensing Nodes, Prototype and Educational Measurement Systems, Industrial Process Monitoring.
Electronic Weigh Scales
The NAU7801KGI is a natural fit for electronic weigh scales because Nuvoton explicitly markets the NAU780 family as a complete front-end solution for bridge/sensor measurement such as weigh scales. A full-scale load-cell output is typically only a few millivolts; the integrated low-noise PGA amplifies this differential signal before the 24-bit delta-sigma converter digitizes it, and family documentation cites up to 23-bit ENOB, enough to resolve gram-level changes on multi-kilogram platforms. In use, the bridge excitation and sense lines are wired to the differential inputs, the I2C bus configures gain and data rate, and the on-chip sinc filter rejects 50/60 Hz mains pickup that would otherwise corrupt low-level readings. The trade-off is conversion latency: high resolution requires lower output data rates and settling time after gain changes.
Recommandé
Strain Gauge Measurement
Strain gauges arranged in Wheatstone bridge configurations produce microvolt-per-ohm-level signals that demand the noise floor the NAU7801KGI provides. With 24-bit resolution and up to 23-bit ENOB performance cited in the Nuvoton family datasheet, the converter can track minute resistance changes caused by mechanical strain without external instrumentation amplifiers. The integrated PGA lets designers trade dynamic range for sensitivity, and the digital filter output is read as a stable 24-bit word over I2C, simplifying firmware on any microcontroller. Because strain monitoring is often continuous, the device's low power consumption supports long-duration, battery-powered structural monitoring nodes. The DIP package is especially convenient for lab benches and test fixtures where strain rigs are reconfigured frequently, though surface-mount family variants serve production hardware.
Recommandé
Pressure Sensor Interfaces
Bridge-type pressure transducers share the same millivolt-level differential output structure as load cells, so the NAU7801KGI digitizes them with the same architecture: PGA gain stages amplify the bridge output, the delta-sigma modulator oversamples it, and the digital filter delivers high-resolution results over I2C. The family's up-to-23-bit ENOB ensures that small pressure-induced signal changes are not lost in converter noise, while the differential input topology rejects common-mode voltage excursions from the excitation supply. In industrial and medical pressure-monitoring products, the I2C bus connects directly to a host MCU that applies calibration coefficients in firmware. Designers should budget settling time after gain or channel switches and use a quiet, stable reference, since reference noise appears directly in the conversion result at this resolution class.
Recommandé
Battery-Powered Precision Sensing Nodes
TechTOnions Electronics notes that the NAU7801KGI's low power consumption makes it suitable for battery-powered devices, and this is where the DIP package plus I2C interface combine into a compelling portable-node front end. A microcontroller can power-gate or duty-cycle the converter, poll readings over two I2C wires, and average multiple 24-bit samples to reach effective resolutions near the family's 23-bit ENOB ceiling. Applications include portable force gauges, handheld luggage and kitchen scales, and wireless structural-health sensors. Because bridge excitation current often dominates the power budget, designers should sequence bridge power with a load switch and sample only when the excitation and reference have stabilized. The trade-off versus continuous operation is slower effective throughput, which is acceptable for the low-speed, high-resolution nature of these measurements.
Recommandé
Prototype and Educational Measurement Systems
The NAU7801KGI's DIP package is a decisive advantage in prototyping, education, and hobbyist precision measurement. Through-hole leads plug directly into solderless breadboards and perfboards, letting students and engineers wire a load cell straight into the differential inputs and read grams or microstrain over I2C within minutes - no hot-air rework or custom PCB required. The same 24-bit converter core and up-to-23-bit-ENOB performance used in commercial weigh scales is preserved, so prototype code and calibration routines transfer directly to production designs using surface-mount NAU780 family parts such as the NAU7802KGI. Recommended practice in these settings includes short, twisted bridge wiring, a solid ground reference, and averaging multiple conversions in firmware, since breadboard contact resistance and noise become visible at microvolt signal levels.
Recommandé
Industrial Process Monitoring
In industrial environments, the NAU7801KGI converts low-level bridge signals from load pins, torque sensors, and process pressure transmitters into clean digital data that survives cable runs to the controller. The integrated digital filter is central here: it attenuates mains-frequency interference and broadband noise picked up along plant wiring, preserving the 24-bit converter's effective resolution without external analog filtering stages. The I2C interface keeps the analog front end local to the sensor, while only two data lines traverse the panel, reducing harness complexity and cost. Using the dual-channel multiplexed capability of the NAU780 family architecture, one converter can service two sensor bridges in alternating sequence for redundancy or multi-point monitoring. System designers should verify the device's operating temperature range against the datasheet for harsh enclosures and allow filter settling after every channel or gain change.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour NAU7801KGI — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | NAU7801SGI | NAU7802KGI |
|---|---|---|---|
| Package | DIP (through-hole) | SMT package variant (different outline) | SMT package (different outline) |
| Brand | Nuvoton Technology | Nuvoton Technology | Nuvoton Technology |
| Resolution | 24 bit | 24 bit | 24 bit |
| ENOB | Up to 23 bit (family) | Up to 23 bit (family) | Up to 23 bit (datasheet Rev 2.4) |
| Interface | I2C | I2C | I2C |
| Application | Bridge sensors / weigh scales | Bridge sensors / weigh scales | Bridge sensors / weigh scales / strain gauges |
| Mounting Type | Through-Hole | Surface Mount | Surface Mount |
| Drop-in Compatibility | Reference (DIP) | No - different package outline, PCB change required | No - different package outline, PCB change required |
Principaux différenciateurs
- Through-hole DIP package for prototyping (vs NAU7802KGI)
- Complete integrated bridge front end (vs NAU7801SGI)
- High effective resolution at low speed (vs Generic general-purpose 24-bit ADCs)
Notes de conception
Keep the bridge analog front end on a clean, quiet section of the board. Route the differential sensor pairs as twisted or closely-coupled pairs, connect the analog ground directly to a single star point, and place decoupling capacitors close to the NAU7801KGI supply pins. At 24-bit resolution, even millivolts of ground bounce from digital switching can consume the LSB budget, so separate the I2C routing from the analog input traces and use the on-chip digital filter rather than relying on board-level RC networks alone.
Two frequent mistakes with high-resolution bridge ADCs: (1) reading data immediately after a gain or channel change - the digital sinc filter needs several conversion cycles to settle, so discard the first readings or wait for the data-ready indication; (2) sharing the bridge excitation supply with noisy digital loads - reference and excitation noise appear directly in the conversion result. Use a dedicated low-noise excitation source or ratiometric wiring so reference noise cancels. Estimated: with a 5 mV full-scale bridge output, 1 LSB at 24 bits corresponds to roughly 0.3 uV, which shows how little noise is tolerable.
For battery-powered weigh-scale nodes, exploit the I2C-controlled configuration to duty-cycle the converter: configure gain and data rate once at init, then poll only when a measurement is needed. Bridge excitation current typically exceeds the converter's own consumption, so switch the bridge supply with a small load switch and allow a stabilization delay before sampling. Confirm exact supply current figures for your selected gain and output data rate in the Nuvoton NAU780 family datasheet rather than relying on typical portable-application assumptions.
Informations de conformité
Compliance data was not present in the verified web data as of 2026-10-11; consult the official Nuvoton product page or distributor compliance documents.
